Jane Bennet understood that Mr. Bingley had removed himself from Netherfield Park with no immediate plans for a return visit. Her heart was broken already when she visited her aunt and uncle Gardiner on Gracechurch Street in Cheapside, but little did she know how thoroughly she would be rebuffed by Caroline Bingley, who she still regarded as a true friend. For someone as gentle as Jane, unable to think ill of others, the insult that Caroline finally gave her (visiting her beyond the prescribed time period that manners dictated, failure to give a reciprocal invitation, and staying for such a short length of time as to be almost insulting) opened Jane's eyes to the situation. Mr. Bingley was meant for Georgiana Darcy, and Jane had no role as either friend to the Bingley sisters or as Mr. Bingley's romantic interest. Only Elizabeth understood how well Jane was able to hide her broken heart from her family.
Imagine how you would feel if Lucy Steele told you about her secret engagement to the man you are interested in and extracts a promise from you to remain silent about the relationship. Imagine Elinor's having to witness Edward and Lucy in the drawing room in her presence and then watch them leave together (reluctantly on his side). Not only does Edward choose to remain with Lucy when his mother finds out about their clandestine relationship, but Colonel Brandon asks Elinor to tell Edward about the living he is willing to give him. The scene is poignant and sad, and we feel for Elinor, who bears these events with fortitude as she supports Marianne in her grief.